 Never running out of hot water? You can have endless hot water. Just call Mathis Plumbing, Heating, and Air and ask about their tankless water heaters. Other benefits of a tankless system? They normally last two to three times longer, you'll save money, and they're more efficient. Plus, for a limited time, Mathis Plumbing, Heating, and Air is offering $250 off a Mathis-installed high-efficiency gas tankless water heater.